yes but till now all stammers we saw after the change of teh questions in december was from dezember from befoure the change.I dont know how long the bots remember their backup accounts but i guess not to long.So for starters we purged december, if more will come from november we wil purge november to.

I run a second cleanup action removing all users that til date ware missing an emaila ctivation,as well as removing all users from 2009 till today that regostration date and first activity date are the same, a.k.a. thay never used thair account, most certenly most of them ware bot accounts.